So I did 2 missions since then with my mod installed … here are the results …
First one was “shopping” at Synedrion for an airship. Once alerted they tend to come in my direction but the only times they took shots against me was when one of my operative was “located”. Both snipers took a potshot and missed. Other than that, they would just move hoping to reveal me. By the way, the airship you steal is considered like an enemy (I guess) and you get “revealed” once standing next to it.
When “located” you still keep your “cloaked” vision (without my mod you don’t know that they actually “hear” where you are).
The second one was a scavenging site against Pandorans. First guy I moved and my whole team got “located” (??!!???). So I “vanished” everyone and it was OK for the rest of the turn. Second turn, the same thing, so I killed the Chiron to see if it was him with an infinite hearing range and vanished everyone again. Third turn, still the same but this time I killed the mist sentinel and after turn 4 everything was fine.
So it would seem that the “mist sentinels” have some kind of power that locates your whole team once one of your operatives moves.
Still, in this one, a sniper triton decided to shoot at one of my operatives although my operative status was neither “located” nor “revealed” when my turn ended and when my next turn started … strange.
I guess that when they are alerted, they “hear” one of the enemies what ever happens (just like we ear them on the other side of the map when looking for the last one to kill on Ancients maps). Annoying, that means that a Chiron will always have a target location to send worms … or hell. Maybe this behavior is triggered once you finished your objectives and just need to evac…